Malicious PDF — malware analysis report

Static analysis result for SHA-256 3661990d2bd4724b…

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 08:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b14e9fd6b4c8345a675f12534a3cd962 SHA-1: 44bbbf29b30e67fa47bfffe2a7bc9041473d2bb2 SHA-256: 3661990d2bd4724b6e4e722bdcf7c8d17b04101dcfd799311d2bf77222124d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in the URLs further supports a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=xanthic+in+a+sentence PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ui6ttb5gsjdppsd16tkobdsge3/lupuranivugobuja.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7iq2s7tdm0j5ore5g49dovauv5/buforagugil.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b456fb74fe4---sonikasad.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/nolasorisiferozozozajopob.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebecaa776d---46794821393.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0ffce168---91438584132.pdfIn PDF document text
    • https://luminex.pl/upload/file/nogar.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/91372634376.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b83341ccb---708069245.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/43023153393.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tra0p3bh9aghqgfrsvgp21m59a/40361722253.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1058cb4a---vataditavixedunirumigitox.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/dusuwoku.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce21737d1d---gekojifawuzorabavipitifit.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/esess00blgn6it357u0v7fnr9d/jowefoxefifimetomor.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/fudavomujaxij.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73767d903---fipumogesaz.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc5e5f31b---wofubugilelofusu.pdfIn PDF document text
    • https://ancoraeducacion.com/images/zixeluwo.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/66231295708.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f537c931---85087480500.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c010b807722---movoletazirozadokevep.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/duwisaxafetuxikebifirepus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 19624 bytes
SHA-256: cd9ce53025a8295107a7cb2c11a4b38eb26582bdba83adee0eafd7a78eff37e9
font_01_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 10068 bytes
SHA-256: 4bb63fe794d4c4ef4eda237ddf069932fa3c588145dd52e3c1d7a56cfce0f082
font_02_sfnt_off00014849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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